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WQ-CD220L
:
?
When test mode 2 is switched to test
Is the spin motor running?
mode 3, does voltage generate between
Yes _ | Faulty spin motor or disconnection
pins 3 and 5 of IC721 for approximately
Yes. (Runs at extremely high
0.3 - 1.5 seconds?
0.3 ~ 1.5sec
speed)
When test mode 2 is switched to test
mode 3, is pin 3 (PWM2) of |C780 at a
high level for 0.3 - 1.5 seconds and then
does a pulse generate?
The 1C780 or microcomputer section is
defective.
svt f LIN
0.3 ~ 1.5sec
Faulty 1C721 or disconnection
Check if the objective lens of the pickup is dirty. If so, clean it.
Check the connection between pin 11 (HF) of CFS700 and pin 17 (HF) of IC780. If OK, the pickup is
defective.
Is an eye pattern being output to pin
3 (HF) of test point TP751? (Even an unclear
waveform is allowable.)
Yes. (Waveform of approximately
Vp-p 1.5 V)
Is the eye pattern of Vp-p 1.5 V being output to pin
Check the PWB pattern and C780.
17 (HF) of IC780?
No
Yes
IC780 is defective.
Is the output of pin 4 (TG1) of TP751 (tracking
error signal) normal in test mode 3?
Is there any output to pin 9 of CFS700?
Check the connection between the CFS700
and flexible PWB. If OK, the pickup is
defective.
Yes
Normal
Check the connection between pin 9 of
CFS700 and pin 3 (TEIN) of 1C750 (or pin
MAAN AO
ANAL
4 (TG1) of TP751) and the PWB pattern.
Is the tracking gain adjusting VR750 set to the
Readjust the tracking gain.
minimum position?
mls
Is there any tracking output to pin 28 (TSOUT) of
ee
the peripheral parts of 10750. If OK, 1C750 is defective.
No
IC750 in test mode 4?
;
_ yves
Is there any Output between pins 11 and 14
heck th
ipheral
parts of IC700. If OK. IC700
i
;
E IC700?
No
Check the peripheral parts o'
:
, C700 is defective.
Yes
[ check the connection between the 1C700, CFS700 and flexible PWB. If OK, the pickup is defective.
|
There is no audio output from both L and R
Check the connection between the pins 6 and 8 of IC810 and the pin 1 and 2 of
channels.
No
CNS881A.
Yes
Is the supply voltage of 1C810 normal?
Check the power line and D901.
No
Are the supply voltages of IC811 normal?
—
Check the power line and the power circuit of the main unit.
|
No
Yes
|
Check the connection betwee, «he |C780
and IC781. If OK, IC780 or IC7g1 is
defective.
Is the digital signal being input to pins 1, 2
Is the signal of pins 6 and 8 of IC810 being
and 3 of 1C810?
output?
Check the IC:811 along the signal flow and then
1C810
is defective.
the connection between them.
:
—~32-
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